Preparation of biomedical amino acid-polyether-polyester triblock copolymer
A technology of amino acid and copolymer, which is applied in the field of preparation of amino acid-polyether-polyester triblock copolymer, which can solve problems such as separation, easy exposure of hydrophobic ends, unstable structure, etc.
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[0020] Take 50g of fully dried D,L-lactide and 50g of polyethylene glycol 2000, put them in a reaction kettle, add 0.07g of stannous chloride, vacuumize, heat to 140°C, and react for 12 hours to obtain a yellow liquid. After cooling to room temperature, centrifuge at a speed of 10,000 rpm for 20 minutes, and take the supernatant for the next step of reaction.
[0021] Take 100ml of the light yellow clear liquid obtained in the above steps, add 300ml of dichloromethane to dissolve, then add 15g of lysine and 0.15g of diisopropylethylamine, and stir at room temperature for 24 hours to obtain the reaction product; Anhydrous glacial diethyl ether was then added for precipitation, and the precipitate was concentrated and dried by a rotary evaporator at 55°C to obtain an amino acid-polyether-polyester copolymer.
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